Just paid $56.00 to have my two rear tires mounted and balanced on my aftermarket wheels. They also use nitrogen. As I recall last spring when I had my all 4 new wheels mounted etc its was around $110.00 I will tell you I did my homework before choosing a shop. I literally asked people with nice aftermarket wheels on their cars who did their work. I'm glad I did because Executive Tire in Rockville, Maryland is excellent!